CN109406270A - The device and its test method of the non-homogeneous multi-direction tensile strength test of eva foam - Google Patents
The device and its test method of the non-homogeneous multi-direction tensile strength test of eva foam Download PDFInfo
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- CN109406270A CN109406270A CN201811168422.4A CN201811168422A CN109406270A CN 109406270 A CN109406270 A CN 109406270A CN 201811168422 A CN201811168422 A CN 201811168422A CN 109406270 A CN109406270 A CN 109406270A
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- eva foam
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- connecting rod
- tensile strength
- test specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
Abstract
The present invention provides the devices and its test method of a kind of non-homogeneous multi-direction tensile strength test of eva foam, described device is equipped with fixture, the fixture includes two pieces of positioning plate, the cylinder in the middle part of the other end of two pieces of positioning plate opposite faces and the first connecting rods for being connected to cylinder tip disposed in parallel, and cylinder is vertically welded in the end face of positioning plate and two cylinders are located on same axis；Two pieces of positioning plates it is opposite be respectively and fixedly provided with haftplatte on one side, be bonded with eva foam test specimen between two pieces of haftplattes；The first connecting rod end at fixture both ends is rotatablely connected with second connecting rod respectively, and the separate other end connecting with first connecting rod of second connecting rod is connected with puller system.The present invention using sandwich bonding sample and carries out tensile strength test with pressing machine, can simulate the non-homogeneous multi-direction loading characteristic in some seas, have the characteristics that principle is reliable, measurement accuracy is high.
Description
Technical field
The present invention relates to the performance tests of oceanographic buoy floating body material, and in particular to non-homogeneous multi-party to a kind of eva foam
To the device and its test method of tensile strength test.
Background technique
China's oceanographic buoy floating body material demand is very big, the foam of EVA material, has insulation, damping, buffering, sound insulation
The functions such as cold-proof, EVA have been obtained in oceanographic buoy in recent years as floating body material and are widely applied.In ocean,
Buoy can shake with wave, have screw rod to be connected to the bracket on floating body top and the counterweight of floating body lower part in floating body, due to wave
Unstability, so floating body is also by various power, such as the pressure of top-support, the pulling force of bottom weight, in floating body
Mastication forces and extruding force of screw rod etc., but measure that analyze all power be to acquire a certain degree of difficulty need various to measure
Power size and simulation analysis calculate other power, project amount is very big.But Compression and Expansion intensity is the one of oceanographic buoy floating body
Item important indicator guarantees that floating body can be used effectively, so needing to measure the Compression and Expansion intensity of floating body.Top set forth above
The pressure of bracket, the pulling force of bottom weight, the mastication forces and extruding force of screw rod can all be given non-homogeneous more to floating body in floating body
The stretching compression force in direction.
EVA is Chinese chemical name: ethene-vinyl acetate copolymer, English language Chemical name made of ethylene and acetic acid copolymerization
Claim: Ethylene Vinyl Acetate Copolymer.Other than technique, in EVA material capability, the performance of eva foam
Also unique.The method that foam tensile intensity is not tested in eva foam field at present.
Document relevant to eva foam performance test is less at present, and most of started with from foam stability test, such as
Patent: a kind of measuring device of foamable composition multiplying power and foam stability, patent No. CN201620079632.6；Foam is stablized
Property be improved application and method, patent No. CN201280034176.8；Deng.
Based on the above situation, the present invention is intended to provide a kind of EVA foam of oceanographic buoy floating body is non-homogeneous multi-party
To tensile strength test method.
Summary of the invention
The present invention utilizes homemade Simple clamp test device, is welded by 304 stainless steel iron props and 304 stainless steel flat plates,
Stainless steel iron prop is simultaneously connected to two stainless steel connecting rods, and the DDL100 pressing machine of arrange in pairs or groups EVA glue special and CRIMS can be into
Row tests eva foam Erichsen test, selects to the floating body material of oceanographic buoy significant.Concrete scheme is as follows:
A kind of device of the non-homogeneous multi-direction tensile strength test of eva foam for oceanographic buoy floating body, the dress
Fixture is installed, the fixture includes two pieces of positioning plates disposed in parallel, in the other end of two pieces of positioning plate opposite faces
The cylinder at middle part and the first connecting rod for being connected to cylinder tip, cylinder are vertically welded in the end face of positioning plate and two circles
Column is located on same axis；
Two pieces of positioning plates it is opposite be respectively and fixedly provided with haftplatte on one side, be bonded with eva foam test specimen between two pieces of haftplattes；
The first connecting rod end at fixture both ends is rotatablely connected with second connecting rod respectively, and second connecting rod is separate to be connected with first connecting rod
The other end connect is connected with puller system.
Further, first connecting rod one end is rigidly connected using bolt attaching nut and cylinder, and the other end uses bolt
Attaching nut is rotatablely connected as shaft and second connecting rod；
The cylinder at fixture both ends and the angle of first connecting rod are identical.
Further, positioning plate and haftplatte are 304 stainless steels, and positioning plate and haftplatte are fastened on one by screw
It rises.
Further, the size of the end face of positioning plate and haftplatte is 60mm*60mm, and haftplatte and eva foam test specimen are viscous
The end face connect is the plane of smooth Non-smooth surface.
Further, positioning plate with a thickness of 3mm.
Further, eva foam test specimen is the cubic block of side length 40mm, and the adhesive surface of eva foam test specimen is to have centainly slightly
The flat cut face of rugosity.
Further, cylinder is the 304 stainless steel cylinders of diameter 15mm, long 20mm.
It is non-homogeneous more to additionally use a kind of eva foam for carrying out oceanographic buoy floating body using above-mentioned apparatus by the present invention simultaneously
Direction tensile strength test method, includes the following steps:
After eva foam excision forming, smooth processing is carried out to eva foam surface with abrasive machine, later to adhesive surface into
The polishing of row sand paper is used as eva foam test specimen；
Sand paper polishing is carried out to the adhesive surface of two pieces of haftplattes；
It is uniformly coated with EVA glue in the adhesive surface of eva foam test specimen and haftplatte, eva foam test specimen is bonded in two pieces and is glued
Between plate；
By two pieces of haftplattes and its between eva foam coupon level place on the table, placed on the haftplatte on top husky
Bag makes closely to bind between eva foam test specimen and haftplatte；
The haftplatte for being bonded with eva foam test specimen is fixed by screws between two pieces of positioning plates of fixture；
Puller system applies drawing force to the second connecting rod at fixture both ends, and adjustment loading speed is loaded, and records eva foam
The maximum value of test specimen tensile strength at different rates；
Change the angle between the second connecting rod axis and positioning plate at fixture both ends, locks second connecting rod and first connecting rod
Fixture nut, different pulling force and torsion are given by the size of change, is reached with this and non-homogeneous multidirectional power is provided,
Multiple groups test is carried out again；
To test result analysis.
Further, eva foam test specimen and haftplatte are in the environment that temperature is 22 DEG C~28 DEG C, humidity is 40%~60%
Bonding for 24 hours, carries out tensile strength test after bonding agent solidification.
If fracture occurs when stretching or serious deformation occurs for eva foam test specimen, can not rebound recovery after taking-up test specimen,
It is considered as the unbearable corresponding tensile strength of the eva foam test specimen.
Further, as follows to test result analysis:
At identical conditions, angle is identical, and loading speed is identical, and 5 specimen tests of every group of carry out take its average value,
If the difference of one of test value and average value is more than the 15% of average value, the test value is rejected, takes the flat of remaining test value
Tensile strength of the mean value as sample under this condition, if still having test value and average value difference in remaining test value is more than average value
15%, then this group of data invalid.
The present invention comes from non-homogeneous multi-direction stress condition to simulate buoy floats in ocean, devises with locked solid
Determine the sandwich fixture of function connecting rod, the present invention is designed in terms of two:
(1) size of stainless steel adhesive sheet bonding plane is slightly larger than the size of bonding sample so that it is convenient to sample and stainless steel
Adhesive sheet is bonded completely, and stainless steel adhesive sheet is connect so that it is convenient to dismantle by 4 positioning bolts with stainless steel positioning plate,
Multiple specimen tests；
(2) the stainless steel cylinder welded on stainless steel positioning plate is connect with two connecting rods, can guarantee test specimen two sides by
When different directions power, correction centering is may be implemented in the pull rod on upper and lower two top, and after change connecting rod angle, nut is locked solid
It is fixed, at this point, puller system has certain twisting resistance and pulling force by the pulling force that connecting rod gives eva foam block, pass through the big of change
It is small to give different pulling force and torsion, reached with this and non-homogeneous multidirectional power is provided.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of non-homogeneous multi-direction tensile strength of eva foam for oceanographic buoy floating body provided by the invention
The schematic diagram of the device of test；
Fig. 2 is the enlarged diagram that fixture clamps eva foam test specimen.
Specific embodiment
In the following description, a large amount of concrete details are given so as to provide a more thorough understanding of the present invention.So
And it is obvious to the skilled person that the present invention may not need one or more of these details and be able to
Implement.In other examples, in order to avoid confusion with the present invention, for some technical characteristics well known in the art not into
Row description.
In order to thoroughly understand the present invention, detailed step and detailed structure will be proposed in following description, so as to
Illustrate technical solution of the present invention.Presently preferred embodiments of the present invention is described in detail as follows, however other than these detailed descriptions, this
Invention can also have other embodiments.
A kind of device of the non-homogeneous multi-direction tensile strength test of eva foam for oceanographic buoy floating body, the dress
Fixture is installed, the fixture includes two pieces of positioning plates 4 disposed in parallel, in the other end of two pieces of 4 opposite faces of positioning plate
The cylinder 3 of Middle face and the first connecting rod 1 for being connected to 3 end of cylinder, cylinder 3 be vertically welded in the end face of positioning plate 4 and
Two cylinders 3 are located on same axis；Two pieces of positioning plates 4 it is opposite be respectively and fixedly provided with haftplatte 8 on one side, between two pieces of haftplattes 8
It is bonded with eva foam test specimen 5；1 end of first connecting rod at fixture both ends is rotatablely connected with second connecting rod 2 respectively, and second connecting rod 2 is remote
It is connected from the other end being connect with first connecting rod 1 with puller system.
1 one end of first connecting rod is using 7 attaching nut of bolt and the rigid connection of cylinder 3 (i.e. between first connecting rod 1 and cylinder 3
It is not able to rotate), and the other end uses 6 attaching nut of bolt to be rotatablely connected as shaft and second connecting rod 2；The cylinder at fixture both ends
3 is identical with the angle of first connecting rod 1.
Positioning plate 4 and haftplatte 8 are 304 stainless steels, and positioning plate 4 and haftplatte 8 are fastened on one by M5 screw 9
It rises.The size of the end face of positioning plate 4 and haftplatte 8 is 60mm*60mm, and the end face Nian Jie with eva foam test specimen of haftplatte 8 is flat
The plane of whole Non-smooth surface.Positioning plate 4 with a thickness of 3mm.Cylinder 3 is the 304 stainless steel cylinders of diameter 15mm, long 20mm.
Eva foam test specimen is the cubic block of side length 40mm, and the adhesive surface of eva foam test specimen is have certain roughness smooth
Cut surface.
The stainless steel cylinder welded on stainless steel positioning plate is connect with two connecting rods, can guarantee test specimen in two sides by difference
When direction force, correction centering is may be implemented in the pull rod on upper and lower two top, and after change connecting rod angle, nut locked and fixed,
At this point, puller system by connecting rod give eva foam block pulling force have certain twisting resistance and pulling force, by the size of change come
Different pulling force and torsion are given, is reached with this and non-homogeneous multidirectional power is provided, to test eva foam test specimen.
The present invention also provides a kind of eva foam for carrying out oceanographic buoy floating body using above-mentioned apparatus is non-homogeneous more simultaneously
Direction tensile strength test method carries out tensile strength using sandwich bonding sample and with the DDL100 pressing machine of CRIMS
Test, this method can simulate the non-homogeneous multi-direction loading characteristic in some seas, have the spy that principle is reliable, measurement accuracy is high
Point.Specific step is as follows:
S1, by after eva foam excision forming, smooth processing is carried out to eva foam surface with abrasive machine, later to adhesive surface
Sand paper polishing removal surface grease is carried out, while improving its roughness, it is ensured that dried flat and rough is steeped as EVA
Foam test specimen 5.
S2, sand paper polishing removal surface grease is carried out to the adhesive surface of two pieces of haftplattes 8, while improving its roughness.
S3, it is uniformly coated with EVA glue in eva foam test specimen 5 and the adhesive surface of haftplatte 8, to about 5 minutes or so, to EVA glue
Water is not touched with one's hand when seemingly do non-dry, and eva foam test specimen 5 is bonded between two pieces of haftplattes 8.
S4, by two pieces of haftplattes 8 and its between eva foam test specimen 5 it is horizontal positioned on the table, it is a certain amount of with plastic bag
Sand shut, be pressed on eva foam test specimen, give and bear a heavy burden, since sand is mobility, it can be ensured that eva foam test specimen
It can be bonded in completely on stainless steel adhesive sheet, sandbag is placed on the haftplatte 8 on top to be made between eva foam test specimen 5 and haftplatte
Close bonding.Control bonding sample is bonded in the environment that temperature is 3 DEG C of 25 DEG C of left back errors or more, humidity is 40%~60%
24h.Tensile strength test is carried out after bonding agent solidification.
S5, the haftplatte 8 for being bonded with eva foam test specimen 5 is fixed by screws between two pieces of positioning plates 4 of fixture；
The DDL100 pressing machine of S6, CRIMS apply drawing force to the second connecting rod 2 at fixture both ends, adjustment loading speed into
Row load, the maximum value of record 5 tensile strength of eva foam test specimen at different rates.
S7, change angle between 2 axis of second connecting rod and positioning plate 4 at fixture both ends, lock second connecting rod 2 and the
The fixture nut of one connecting rod 1 gives different pulling force and torsion by the size of change, and it is non-homogeneous multi-party to reach offer with this
To power, then carry out multiple groups test.
S8, to test result analysis.At identical conditions, angle is identical, and loading speed is identical, every group of carry out 5 examinations
Sample test, takes its average value, if the difference of one of test value and average value is more than the 15% of average value, rejects the test
Value takes the average value of remaining test value to be used as the tensile strength of sample under this condition, if still have in remaining test value test value and
Average value difference is more than the 15% of average value, then this group of data invalid.If fracture occurs when stretching or occurs tight for eva foam test specimen
Deformation again can not rebound recovery after taking out test specimen, be considered as the unbearable corresponding tensile strength of the eva foam test specimen.
Presently preferred embodiments of the present invention is described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, devices and structures not described in detail herein should be understood as gives reality with the common mode in this field
It applies；Anyone skilled in the art, without departing from the scope of the technical proposal of the invention, all using the disclosure above
Methods and technical content many possible changes and modifications are made to technical solution of the present invention, or be revised as equivalent variations etc.
Embodiment is imitated, this is not affected the essence of the present invention.Therefore, anything that does not depart from the technical scheme of the invention, foundation
Technical spirit of the invention any simple modifications, equivalents, and modifications made to the above embodiment, still fall within the present invention
In the range of technical solution protection.
Claims (10)
1. a kind of device of the non-homogeneous multi-direction tensile strength test of eva foam for oceanographic buoy floating body, feature exist
Fixture is equipped in, described device, and the fixture includes two pieces of positioning plates (4) disposed in parallel, in two pieces of positioning plate (4) phases
Cylinder (3) in the middle part of the other end on opposite and the first connecting rod (1) for being connected to cylinder (3) end, cylinder (3) vertical welding
Positioning plate (4) end face and two cylinders (3) be located on same axis；
Two pieces of positioning plates (4) are opposite to be respectively and fixedly provided with haftplatte (8) on one side, is bonded with eva foam test specimen between two pieces of haftplattes (8)
(5)；
First connecting rod (1) end at fixture both ends is rotatablely connected with second connecting rod (2) respectively, and second connecting rod (2) is separate with first
The other end of connecting rod (1) connection is connected with puller system.
2. as described in claim 1 for the non-homogeneous multi-direction tensile strength test of eva foam of oceanographic buoy floating body
Device, which is characterized in that first connecting rod (1) one end is rigidly connected using bolt attaching nut and cylinder (3), and the other end uses
Bolt attaching nut is rotatablely connected as shaft and second connecting rod (2)；
The cylinder (3) at fixture both ends is identical with the angle of first connecting rod (1).
3. as described in claim 1 for the non-homogeneous multi-direction tensile strength test of eva foam of oceanographic buoy floating body
Device, which is characterized in that positioning plate (4) and haftplatte (8) are 304 stainless steels, and positioning plate (4) and haftplatte (8) pass through
Screw tightens together.
4. as described in claim 1 for the non-homogeneous multi-direction tensile strength test of eva foam of oceanographic buoy floating body
Device, which is characterized in that the size of the end face of positioning plate (4) and haftplatte (8) is 60mm*60mm, and haftplatte (8) and EVA steep
The end face of foam test specimen bonding is the plane of smooth Non-smooth surface.
5. as described in claim 1 for the non-homogeneous multi-direction tensile strength test of eva foam of oceanographic buoy floating body
Device, which is characterized in that positioning plate (4) with a thickness of 3mm.
6. as described in claim 1 for the non-homogeneous multi-direction tensile strength test of eva foam of oceanographic buoy floating body
Device, which is characterized in that eva foam test specimen is the cubic block of side length 40mm, and the adhesive surface of eva foam test specimen is certain coarse to have
The flat cut face of degree.
7. as described in claim 1 for the non-homogeneous multi-direction tensile strength test of eva foam of oceanographic buoy floating body
Device, which is characterized in that cylinder (3) is the 304 stainless steel cylinders of diameter 15mm, long 20mm.
8. a kind of non-homogeneous multi-direction stretching of eva foam for carrying out oceanographic buoy floating body using device as claimed in claim 2
Strength Testing Methods, which comprises the steps of:
After eva foam excision forming, smooth processing is carried out to eva foam surface with abrasive machine, sand is carried out to adhesive surface later
Paper polishing is used as eva foam test specimen (5)；
Sand paper polishing is carried out to the adhesive surface of two pieces of haftplattes (8)；
Adhesive surface in eva foam test specimen (5) and haftplatte (8) is uniformly coated with EVA glue, and eva foam test specimen (5) is bonded in two
Between block haftplatte (8)；
By two pieces of haftplattes (8) and its between eva foam test specimen (5) it is horizontal positioned on the table, put on the haftplatte (8) on top
Setting sandbag makes closely to bind between eva foam test specimen (5) and haftplatte；
The haftplatte (8) for being bonded with eva foam test specimen (5) is fixed by screws between two pieces of positioning plates (4) of fixture；
Puller system applies drawing force to the second connecting rod (2) at fixture both ends, and adjustment loading speed is loaded, and records eva foam
The maximum value of test specimen (5) tensile strength at different rates；
Change the angle between second connecting rod (2) axis and positioning plate (4) at fixture both ends, locked second connecting rod (2) and the
The fixture nut of one connecting rod (1) gives different pulling force and torsion by the size of change, and it is non-homogeneous more to reach offer with this
The power in direction, then carry out multiple groups test；
To test result analysis.
9. the non-homogeneous multi-direction tensile strength test method of the eva foam of oceanographic buoy floating body as claimed in claim 8,
Be characterized in that, eva foam test specimen and haftplatte in the environment that temperature is 22 DEG C~28 DEG C, humidity is 40%~60% it is be bonded for 24 hours,
Tensile strength test is carried out after bonding agent solidification.
If fracture occurs when stretching or serious deformation occurs for eva foam test specimen, can not rebound recovery after taking-up test specimen, be considered as
The unbearable corresponding tensile strength of the eva foam test specimen.
10. the non-homogeneous multi-direction tensile strength test method of the eva foam of oceanographic buoy floating body as claimed in claim 8,
It is characterized in that, as follows to test result analysis:
At identical conditions, angle is identical, and loading speed is identical, and 5 specimen tests of every group of carry out take its average value, if its
In the difference of a test value and average value be more than average value 15%, then reject the test value, take the average value of remaining test value
As the tensile strength of sample under this condition, if still having test value and average value difference in remaining test value is more than average value
15%, then this group of data invalid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811168422.4A CN109406270B (en) | 2018-10-08 | 2018-10-08 | Heterogeneous multidirectional EVA foam tensile strength test method for ocean buoy floating body |
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|---|---|---|---|
| CN201811168422.4A CN109406270B (en) | 2018-10-08 | 2018-10-08 | Heterogeneous multidirectional EVA foam tensile strength test method for ocean buoy floating body |
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| CN109406270B CN109406270B (en) | 2021-05-07 |
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| CN109406270B (en) | 2021-05-07 |
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